Persistent layer device and database operation method

Abstract

The invention provides a persistent layer device and a database operation method. The method comprises the following steps: establishing at least one group of preset tables in advance, wherein each group of preset tables comprises at least one database table; establishing a management table, and managing the preset table; carrying out a DML (Data Manipulation Language) operation on the management table; mapping the management table and a persistent object PO (Persistent Object) class through a configuration file; and finally, packaging a one-to-one correspondence relationship obtained by mapping into one object operation; and providing the packaged object operation for outside to be called through a uniform external operation interface. In the process, the double-layer table structure design of the management table and the preset table converts a complex database DDL (Data Definition Language) operation into a simple database DML operation, a defect that a static configuration file restricts certain DDL operations on the database by an application system in a traditional persistent layer structure can be solved, and the flexible operation of the database is realized.

Description

technical field [0001] The invention relates to database technology, in particular to a persistent layer device and a database operation method. Background technique [0002] Persistence technology refers to the technology of saving data to a power-down storage device. For application systems, persistence usually saves data in a database. The purpose of designing the persistence layer is to achieve data persistence and solve the impedance mismatch between the object-oriented development method of the application system and the relational model of the database. [0003] Currently, the persistence layer is generated through an object relational mapping (ObjectRelationalMapping, ORM) method. Taking Hibernate, the mainstream persistence layer framework in the industry, as an example, during the generation of the persistence layer, the database table (that is, the table in the database) and the persistent object (PersistentObject, PO) class in the object-oriented development me...

AI Technical Summary

Problems solved by technology

However, the configuration file is a static Extensible Markup Language (XML) configuration file. Since the data definition language (Data Definition Language, DDL) operation will change the content of the configuration file to a certain extent, once the configuration file is modified, it must be reloaded. , multiple overloads will also cause database instability

Therefore, static configuration files will restrict some DDL operations of the application system on the database, resulting in low flexibility for database operations

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